[perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM

In http://nntp.perl.org/group/perl.perl5.porters/235003, which got attached to the wrong ticket, it was proposed to possibly revert the patch.  I do not believe that it is acceptable to eat up all the machine's available memory. which would be one consequence of that reversion.

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via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=126182

• [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by James E Keenan via RT
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by demerphq
• [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by Karl Williamson via RT
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by demerphq
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by Zefram
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by demerphq
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by Zefram
• Re: [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by demerphq
• [perl #126182] /(.(?2))((?<=(?=(?1)).))/ hangs and eats allavailable RAM by Karl Williamson via RT